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Threat Encyclopedia

TROJ_MEDFOS.SMI

ANALYSIS BY

Adrianne Chester Camat

     MODIFIED BY

     Michelle Morales


ALIASES:

Trojan:Win32/Medfos.A (Microsoft); Medfos.aq (McAfee); Trojan.Malcol (Symantec); Trojan.Win32.Midhos.vbp (Kaspersky); Trojan.Win32.Medfos.t (v) (Sunbelt); Win32/Cryptor (AVG)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:
INFORMATION EXPOSURE:

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

10.479.00

VSAPI OPR PATTERN Date:

17 Dec 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.


  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • {random filename} = "rundll32.exe, "%Application Data%\{random filename}.dll",{export function}"

Step 5

Remove malware/grayware files dropped/downloaded by TROJ_MEDFOS.SMI. (Note: Please skip this step if the threats listed below have already been removed.)

    • %Application Data%\{random filename}.dll

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MEDFOS.SMI. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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